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Commit 64d2c22a authored by Dan Carpenter's avatar Dan Carpenter Committed by David S. Miller
Browse files

mlx5: use after free in mlx5_cmd_comp_handler() 



We can't dereference "ent" after passing it to free_cmd().

Signed-off-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 4ea72445

drivers/net/ethernet/mellanox/mlx5/core/cmd.c

+7 −4
Original line number Diff line number Diff line
@@ -1113,7 +1113,13 @@ void mlx5_cmd_comp_handler(struct mlx5_core_dev *dev, unsigned long vector) 


	for (i = 0; i < (1 << cmd->log_sz); i++) {

		if (test_bit(i, &vector)) {

			struct semaphore *sem;



			ent = cmd->ent_arr[i];

			if (ent->page_queue)

				sem = &cmd->pages_sem;

			else

				sem = &cmd->sem;

			ktime_get_ts(&ent->ts2);

			memcpy(ent->out->first.data, ent->lay->out, sizeof(ent->lay->out));

			dump_command(dev, ent, 0);
@@ -1136,10 +1142,7 @@ void mlx5_cmd_comp_handler(struct mlx5_core_dev *dev, unsigned long vector) 
			} else {

				complete(&ent->done);

			}

			if (ent->page_queue)

				up(&cmd->pages_sem);

			else

				up(&cmd->sem);

			up(sem);

		}

	}

}